:root {
    --primary-color: #0066cc;
    --secondary-color: #f8f9fa;
    --accent-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --dark-color: #343a40;
    --light-color: #ffffff;
    --border-radius: 12px;
    --box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark-color);
}

/* Header Styles */
.main-header {
    background: var(--light-color);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--primary-color);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color) !important;
    display: flex;
    align-items: center;
    gap: 10px;
}

    .navbar-brand i {
        font-size: 2rem;
        background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

.nav-link {
    color: var(--dark-color) !important;
    font-weight: 500;
    padding: 0.75rem 1rem !important;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

    .nav-link:hover {
        background: var(--primary-color);
        color: var(--light-color) !important;
        transform: translateY(-2px);
    }

    .nav-link.active {
        background: var(--primary-color);
        color: var(--light-color) !important;
    }

/* Language Selector */
.language-selector {
    min-width: 200px;
}

/* Main Content */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 80px);
}

.content-card {
    background: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 2rem;
    border: none;
    transition: var(--transition);
}

    .content-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 35px rgba(0,0,0,0.15);
    }

.card-header-custom {
    background: linear-gradient(135deg, var(--primary-color), #0052a3);
    color: var(--light-color);
    padding: 2rem;
    border: none;
}

.card-title-custom {
    font-size: 1.75rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    text-align: center;
}

.info-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-card {
    background: rgba(255,255,255,0.1);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--warning-color);
}

    .info-card p {
        margin-bottom: 0.5rem;
        font-size: 0.95rem;
    }

    .info-card a {
        color: var(--warning-color);
        text-decoration: none;
        font-weight: 500;
        transition: var(--transition);
    }

        .info-card a:hover {
            color: #fff;
            text-decoration: underline;
        }

.contact-section {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-top: 1rem;
}

.contact-btn {
    background: var(--accent-color);
    color: var(--light-color);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

    .contact-btn:hover {
        background: #218838;
        color: var(--light-color);
        transform: scale(1.05);
    }

/* Form Styles */
.form-section {
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    display: block;
}

.form-control-custom {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: #f8f9fa;
}

    .form-control-custom:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 0.2rem rgba(0,102,204,0.25);
        background: var(--light-color);
    }

.form-select-custom {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 6 7 7 7-7'/%3e%3c/svg%3e");
}

.btn-primary-custom {
    background: linear-gradient(135deg, var(--primary-color), #0052a3);
    border: none;
    color: var(--light-color);
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0,102,204,0.3);
}

    .btn-primary-custom:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(0,102,204,0.4);
        background: linear-gradient(135deg, #0052a3, var(--primary-color));
    }

/* Table Styles */
.table-container {
    background: var(--light-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.table-custom {
    margin: 0;
}

    .table-custom thead th {
        background: var(--primary-color);
        color: var(--light-color);
        font-weight: 600;
        border: none;
        padding: 1rem;
    }

    .table-custom tbody tr {
        transition: var(--transition);
    }

        .table-custom tbody tr:hover {
            background: rgba(0,102,204,0.05);
        }

    .table-custom td {
        padding: 1rem;
        border-color: #e9ecef;
    }

/* Modal Styles */
.modal-content-custom {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--box-shadow);
}

.modal-header-custom {
    background: var(--primary-color);
    color: var(--light-color);
    border: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: var(--light-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem 0;
    }

    .card-header-custom {
        padding: 1.5rem 1rem;
    }

    .form-section {
        padding: 1.5rem 1rem;
    }

    .info-section {
        grid-template-columns: 1fr;
    }

    .contact-section {
        flex-direction: column;
        align-items: flex-start;
    }

    .navbar-brand {
        font-size: 1.25rem;
    }
}

@media (max-width: 576px) {
    .card-title-custom {
        font-size: 1.5rem;
    }

    .btn-primary-custom {
        width: 100%;
        padding: 1rem;
    }
}

/* Utility Classes */
.d-none {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mb-3 {
    margin-bottom: 1rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}
/* CSS cho table responsive */
@media screen and (max-width: 768px) {
    #tableResult .table-mail-content {
        font-size: 12px !important;
        border: 0 !important;
    }

        #tableResult .table-mail-content thead {
            display: none !important;
        }

        #tableResult .table-mail-content tbody tr {
            display: block !important;
            border: 1px solid #ddd !important;
            margin-bottom: 15px !important;
            padding: 10px !important;
            border-radius: 8px !important;
            background: #fff !important;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1) !important;
        }

        #tableResult .table-mail-content tbody td {
            display: block !important;
            text-align: left !important;
            border: none !important;
            padding: 8px 0 !important;
            border-bottom: 1px solid #eee !important;
            position: relative !important;
            padding-left: 100px !important;
        }

            #tableResult .table-mail-content tbody td:last-child {
                border-bottom: none !important;
            }

            #tableResult .table-mail-content tbody td:before {
                font-weight: bold !important;
                color: #333 !important;
                position: absolute !important;
                left: 0 !important;
                width: 90px !important;
                top: 8px !important;
                font-size: 11px !important;
            }

            /* Labels cho từng cột */
            #tableResult .table-mail-content tbody td:nth-child(1):before {
                content: "STT:" !important;
            }

            #tableResult .table-mail-content tbody td:nth-child(2):before {
                content: "From:" !important;
            }

            #tableResult .table-mail-content tbody td:nth-child(3):before {
                content: "To:" !important;
            }

            #tableResult .table-mail-content tbody td:nth-child(4):before {
                content: "Subject:" !important;
            }

            #tableResult .table-mail-content tbody td:nth-child(5):before {
                content: "Time:" !important;
            }

            #tableResult .table-mail-content tbody td:nth-child(6):before {
                content: "Content:" !important;
            }

            #tableResult .table-mail-content tbody td:nth-child(7):before {
                content: "Code:" !important;
            }

            /* Responsive cho nội dung dài */
            #tableResult .table-mail-content tbody td:nth-child(4),
            #tableResult .table-mail-content tbody td:nth-child(7) {
                word-break: break-word !important;
                overflow-wrap: break-word !important;
            }

        /* Button responsive */
        #tableResult .table-mail-content .btn {
            font-size: 12px !important;
            padding: 5px 10px !important;
            margin-top: 5px !important;
        }
}

/* Cho màn hình rất nhỏ */
@media screen and (max-width: 480px) {
    #tableResult .table-mail-content tbody td {
        padding-left: 80px !important;
    }

        #tableResult .table-mail-content tbody td:before {
            width: 70px !important;
            font-size: 10px !important;
        }
}

/* Modal custom cho Quick Buy */
.modal-content-quick-buy {
    border-radius: 18px;
    border: none;
    box-shadow: 0 8px 36px rgba(0,102,204,0.12);
    background: #f4f8fb;
    animation: fadeIn 0.5s;
}

.modal-header-quick-buy {
    background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
    color: #fff;
    border-radius: 18px 18px 0 0;
    border-bottom: 2px solid #28a745;
}

.modal-title-quick-buy {
    font-weight: bold;
    font-size: 1.45rem;
    letter-spacing: 0.02em;
}

.modal-body-quick-buy {
    padding: 2rem 1.5rem 1rem 1.5rem;
}

.form-group-quick-buy {
    margin-bottom: 1.25rem;
}

.form-label-quick-buy {
    font-weight: 600;
    color: #34495e;
    margin-bottom: 0.5rem;
    display: block;
    font-size: 1rem;
}

.form-control-quick-buy, .form-select-quick-buy {
    width: 100%;
    padding: 0.65rem 1rem;
    border: 2px solid #e4e9f1;
    border-radius: 10px;
    font-size: 1rem;
    background: #fff;
    margin-bottom: 0.25rem;
    transition: border 0.2s;
}

    .form-control-quick-buy:focus, .form-select-quick-buy:focus {
        border-color: #0066cc;
        background: #eef6fd;
        outline: none;
    }

.price-info {
    background: #e7f5e6;
    color: #249c42;
    border-radius: 8px;
    padding: 0.8rem 1rem;
    font-size: 1.1rem;
    margin: 1.1rem 0 0.7rem 0;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.note-warning {
    color: #d35400;
    font-size: 0.92em;
    margin-top: 0.2em;
    display: block;
    font-weight: 500;
}

.non-refundable-alert {
    background: #fff6e0;
    color: #b37b10;
    padding: 0.9rem 1rem;
    border-left: 5px solid #ffc107;
    border-radius: 7px;
    font-size: 1.07rem;
    font-weight: 600;
    margin: 1.2rem 0 0 0;
    display: flex;
    align-items: center;
    gap: 7px;
    box-shadow: 0 2px 12px rgba(255,193,7,0.06);
}

.modal-footer-quick-buy {
    background: none;
    border-top: none;
    padding: 1.2rem 1.5rem 1.5rem 1.5rem;
    border-radius: 0 0 18px 18px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.btn-submit-quick-buy {
    background: linear-gradient(135deg, #28a745 40%, #34d058 100%);
    color: #fff;
    border: none;
    padding: 0.7rem 2.1rem;
    border-radius: 22px;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(40,167,69,0.13);
    transition: background 0.2s, transform 0.2s;
    display: flex;
    align-items: center;
    gap: 7px;
}

    .btn-submit-quick-buy:hover, .btn-submit-quick-buy:focus {
        background: linear-gradient(135deg, #34d058 40%, #249c42 100%);
        transform: translateY(-2px) scale(1.02);
        color: #fff;
    }

.btn-close-quick-buy {
    background: #ddd;
    color: #495057;
    border: none;
    padding: 0.7rem 1.8rem;
    border-radius: 22px;
    font-weight: 500;
    font-size: 1.07rem;
    box-shadow: 0 2px 8px rgba(40,40,40,0.07);
    transition: background 0.2s, color 0.2s;
    display: flex;
    align-items: center;
    gap: 7px;
}

    .btn-close-quick-buy:hover, .btn-close-quick-buy:focus {
        background: #e74c3c;
        color: #fff;
    }

@media (max-width: 576px) {
    .modal-body-quick-buy, .modal-footer-quick-buy {
        padding: 1rem;
    }

    .modal-content-quick-buy, .modal-header-quick-buy {
        border-radius: 12px !important;
    }
}


.quick-buy-section {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    padding: 1rem 0.75rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}

    .quick-buy-section::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
        transition: left 0.5s;
    }

    .quick-buy-section:hover::before {
        left: 100%;
    }

.quick-buy-btn {
    background: linear-gradient(135deg, var(--light-color), #f8f9fa);
    color: var(--dark-color);
    border: none;
    padding: 0.5rem 1.5rem; /* Giảm padding */
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
}

    .quick-buy-btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
        opacity: 0;
        transition: opacity 0.3s ease;
        z-index: 1;
    }

    .quick-buy-btn:hover::before {
        opacity: 1;
    }

    .quick-buy-btn:hover {
        color: var(--light-color);
        transform: translateY(-3px) scale(1.05);
        box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    }

    .quick-buy-btn span {
        position: relative;
        z-index: 2;
    }

.quick-buy-subtitle {
    color: var(--light-color);
    font-weight: 600;
    margin-top: 1rem;
    font-size: 1.1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

@media (max-width: 768px) {
    .quick-buy-section {
        padding: 0.7rem 0.3rem; /* Giữ nền gọn */
        margin-bottom: 0.45rem;
    }

    .quick-buy-btn {
        padding: 0.36rem 1rem;
        font-size: 0.98rem; 
        min-width: unset;
        border-radius: 22px;
        line-height: 1.25;
    }

        .quick-buy-btn i {
            font-size: 1.08em;
            margin-right: 0.45em;
        }

    .quick-buy-subtitle {
        font-size: 0.85rem;
        margin-top: 0.6rem;
    }
}

@media (max-width: 576px) {
    .quick-buy-section {
        padding: 1.1rem 1.2rem;
    }

    .quick-buy-btn {
        padding: 0.25rem 0.85rem;
        font-size: 0.92rem;
        border-radius: 16px;
    }

    .quick-buy-subtitle {
        font-size: 0.8rem;
        margin-top: 0.6rem;
    }
}

@media (max-width: 768px) {
    .contact-section {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
        margin-top: 0.5rem;
    }

        .contact-section span {
            font-size: 0.97rem;
            margin-bottom: 0.3rem;
        }

    .contact-btn {
        font-size: 0.98rem;
        padding: 0.32rem 0.7rem;
        border-radius: 16px;
        min-width: 0;
        box-shadow: 0 1px 3px rgba(40,167,69,0.08);
    }

        .contact-btn i {
            font-size: 1rem;
        }
}

@media (max-width: 500px) {
    .contact-btn {
        font-size: 0.92rem;
        padding: 0.26rem 0.5rem;
    }

    .contact-section span {
        font-size: 0.91rem;
    }
}

/* ==== MODAL QUICK BUY HOTMAIL ==== */

/* Modal header */
#quickBuyModal .modal-header {
    background: linear-gradient(90deg, #0d6efd 10%, #5eead4 90%);
    color: #fff;
    border-top-left-radius: .6rem;
    border-top-right-radius: .6rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

#quickBuyModal .modal-title i {
    color: #f9fafb;
    font-size: 1.4rem;
}

#quickBuyModal .btn-close {
    filter: brightness(1.5);
}

/* Modal content border and radius */
#quickBuyModal .modal-content {
    border-radius: .7rem;
    border: none;
    box-shadow: 0 4px 32px 0 rgba(44,62,80,.07);
    overflow: hidden;
}

/* Left column */
#quickBuyModal .col-md-5 {
    border-right: 1px solid #ececec;
    background: linear-gradient(135deg, #f9fafb 60%, #e9f5fb 100%);
    padding-top: 1rem;
    padding-bottom: 1rem;
    min-height: 410px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

    #quickBuyModal .col-md-5 h5 {
        font-size: 1.14rem;
        letter-spacing: 0.2px;
    }

#quickBuyModal ul.small li {
    margin-bottom: .3rem;
}

#quickBuyModal .alert-warning {
    background: #fff9ea;
    border: 1.5px solid #ffe5b2;
    font-size: .97rem;
    color: #d97706;
    margin-bottom: .7rem !important;
    padding: 7px 14px;
    border-radius: 7px;
}

    #quickBuyModal .alert-warning .fa-info-circle {
        font-size: 1.13em;
    }

#quickBuyModal .small .fa-shield-halved {
    font-size: 1em;
}

#quickBuyModal .mb-2.small {
    color: #26795c;
    font-size: 0.97em;
    background: #ecfdf5;
    border-radius: 7px;
    padding: 6px 12px;
    margin-bottom: .6rem;
}

/* Right column (form) */
#quickBuyModal .col-md-7 {
    padding-top: 1rem;
    padding-bottom: 1rem;
}

#quickBuyModal .form-label i {
    color: #0d6efd;
    font-size: 1.12em;
}

#quickBuyModal .form-control:focus,
#quickBuyModal .form-select:focus {
    border-color: #5eead4;
    box-shadow: 0 0 0 0.1rem #5eead47d;
}

#quickBuyModal .bg-light {
    background: #f1f5f9 !important;
}

#quickBuyModal .border {
    border-color: #e2e8f0 !important;
}

#quickBuyModal .form-text.text-muted {
    margin-top: .15rem;
    font-size: .97em;
}

#quickBuyModal #totalPrice {
    font-size: 1.2rem;
    letter-spacing: 1px;
    margin-left: 8px;
}

#quickBuyModal .alert-danger {
    background: #fff3f3;
    color: #dc2626;
    border-color: #fee2e2;
    font-size: .98em;
    padding: 9px 15px;
    border-radius: 7px;
}

    #quickBuyModal .alert-danger i {
        font-size: 1.15em;
        color: #ef4444;
        margin-right: 3px;
    }

#quickBuyModal .btn {
    font-size: 1rem;
    border-radius: 5px;
    padding: 7px 20px 8px 16px;
    min-width: 120px;
}

#quickBuyModal .btn-primary {
    background: linear-gradient(90deg, #0d6efd 60%, #0ec6d4 100%);
    border: none;
    font-weight: 600;
    letter-spacing: 0.3px;
    box-shadow: 0 2px 8px 0 rgba(0, 212, 255, .09);
    transition: background 0.17s, box-shadow 0.17s;
}

    #quickBuyModal .btn-primary:hover {
        background: linear-gradient(90deg, #0987e1 60%, #17bb98 100%);
        box-shadow: 0 3px 18px 0 rgba(0, 212, 255, .10);
    }

#quickBuyModal .btn-outline-secondary {
    border-color: #b3b9c7 !important;
    color: #5c6770;
    font-weight: 500;
    background: #f8fafc;
    transition: background 0.17s, color 0.17s;
}

    #quickBuyModal .btn-outline-secondary:hover {
        color: #222;
        background: #e2e8f0;
    }

#quickBuyModal .form-group,
#quickBuyModal .mb-3 {
    margin-bottom: 1.07rem !important;
}

#quickBuyModal .form-label {
    margin-bottom: .36rem;
}

/* ----- Custom báo lỗi input ------ */
#quickBuyModal .form-control.is-invalid,
#quickBuyModal .form-select.is-invalid {
    border-color: #ef4444 !important;
    background: #fff6f6;
    color: #c81e1e;
    box-shadow: 0 1px 7px #fee2e2a2;
}

    #quickBuyModal .form-control.is-invalid:focus,
    #quickBuyModal .form-select.is-invalid:focus {
        border-color: #ef4444 !important;
        box-shadow: 0 0 0 .17rem #fee2e2c9;
        background: #fff6f6;
    }

#quickBuyModal .invalid-feedback {
    display: block;
    margin-top: 2px;
    color: #dc2626;
    font-size: .97em;
    padding-left: 3px;
    min-height: 18px;
    font-style: italic;
}

/* Hiệu ứng rung nhẹ khi báo lỗi */
@keyframes shake {
    0% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-6px);
    }

    40% {
        transform: translateX(6px);
    }

    60% {
        transform: translateX(-3px);
    }

    80% {
        transform: translateX(3px);
    }

    100% {
        transform: translateX(0);
    }
}

#quickBuyModal .form-control.is-invalid,
#quickBuyModal .form-select.is-invalid {
    animation: shake 0.17s linear;
}

#quickBuyModal .form-control,
#quickBuyModal .form-select {
    transition: border-color 0.17s, box-shadow 0.17s, background 0.17s;
}

/* Responsive: Tăng margin khi xếp dọc */
@media (max-width: 991px) {
    #quickBuyModal .modal-dialog {
        max-width: 98vw;
    }

    #quickBuyModal .col-md-5,
    #quickBuyModal .col-md-7 {
        border: none !important;
        min-height: auto !important;
        padding-top: 0 !important;
        padding-bottom: 0 !important;
        margin-bottom: 18px;
    }

    #quickBuyModal .row.g-4 {
        flex-direction: column;
    }
}

@media (max-width: 575.98px) {
    #quickBuyModal .modal-content {
        border-radius: 10px;
    }

    #quickBuyModal .modal-header {
        padding: 13px 12px;
    }

    #quickBuyModal .modal-body {
        padding: 15px 5px 14px 7px;
    }

    #quickBuyModal .btn {
        min-width: 80px;
        font-size: .97rem;
    }
}
/* === Giảm khoảng cách form modal Hotmail === */
#quickBuyModal .form-group,
#quickBuyModal .mb-3 {
    margin-bottom: 0.42rem !important; /* Gọn hẳn */
}

#quickBuyModal .form-label {
    margin-bottom: 0.16rem; /* Nhãn gần input hơn */
}

#quickBuyModal .form-text.text-muted,
#quickBuyModal .invalid-feedback {
    margin-top: 0.07rem;
    margin-bottom: 0.07rem;
    font-size: .96em;
}

#quickBuyModal .form-control,
#quickBuyModal .form-select {
    padding-top: 0.40rem;
    padding-bottom: 0.40rem;
    font-size: .97rem;
}

#quickBuyModal .bg-light.rounded.p-2.border.d-flex.align-items-center {
    margin-bottom: 0.36rem;
    margin-top: 0.08rem;
    padding: 0.44rem 0.8rem;
}

#quickBuyModal .alert-danger,
#quickBuyModal .alert-warning {
    margin-top: 0.45rem;
    margin-bottom: 0.46rem !important;
    padding: 7px 11px;
    font-size: .96em;
    border-radius: 7px;
}

#quickBuyModal .btn,
#quickBuyModal .d-flex.gap-2 {
    margin-top: 0.13rem;
    margin-bottom: 0.13rem;
}

#quickBuyModal .col-md-7 {
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
}

#quickBuyModal .col-md-5 {
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
}

#quickBuyModal .modal-header {
    padding-top: 0.7rem;
    padding-bottom: 0.55rem;
}
/* Nếu muốn cực ngắn, chỉnh .mb-3 xuống 0.32rem cũng ok */
@media (max-width: 991px) {
    #quickBuyModal .col-md-5,
    #quickBuyModal .col-md-7 {
        margin-bottom: 8px;
        padding-top: 0.35rem !important;
        padding-bottom: 0.35rem !important;
    }

    #quickBuyModal .mb-3,
    #quickBuyModal .form-group {
        margin-bottom: 0.32rem !important;
    }
}

@media (max-width: 575.98px) {
    #quickBuyModal .modal-content {
        border-radius: 10px;
    }

    #quickBuyModal .modal-header {
        padding: 10px 10px;
    }

    #quickBuyModal .modal-body {
        padding: 10px 4px 8px 4px;
    }

    #quickBuyModal .btn {
        min-width: 70px;
        font-size: .96rem;
    }
}
#quickBuyModal .mb-3,
#quickBuyModal .form-group {
    margin-bottom: 0.32rem !important;
}

#quickBuyModal .form-label {
    margin-bottom: 0.12rem;
}

#quickBuyModal .form-text,
#quickBuyModal .invalid-feedback {
    margin-top: 0.04rem;
    margin-bottom: 0.04rem;
}

#quickBuyModal .form-control,
#quickBuyModal .form-select {
    font-size: .97rem;
    padding-top: .36rem;
    padding-bottom: .36rem;
}

#quickBuyModal .bg-light.rounded.p-2.border.d-flex.align-items-center {
    margin-bottom: 0.2rem;
    margin-top: 0.04rem;
    padding: 0.36rem 0.7rem;
}

#quickBuyModal .alert-danger, #quickBuyModal .alert-warning {
    margin-top: 0.26rem;
    margin-bottom: 0.28rem !important;
    padding: 5px 8px;
    font-size: .96em;
}

#quickBuyModal .btn,
#quickBuyModal .d-flex.gap-2 {
    margin-top: 0.12rem;
    margin-bottom: 0.12rem;
}

#quickBuyModal .col-md-7, #quickBuyModal .col-md-5 {
    padding-top: 0.45rem;
    padding-bottom: 0.45rem;
}

#quickBuyModal .modal-header {
    padding-top: 0.45rem;
    padding-bottom: 0.38rem;
}

#quickBuyModal .invalid-feedback {
    display: none;
    color: #e53935 !important;
    font-size: .96em;
    padding-left: 2px;
    margin-top: 2px;
    margin-bottom: 1px;
    font-style: normal;
    font-weight: 500;
}

#quickBuyModal .is-invalid + .invalid-feedback,
#quickBuyModal .form-select.is-invalid + .invalid-feedback {
    display: block !important;
}

#quickBuyModal .form-control.is-invalid,
#quickBuyModal .form-select.is-invalid {
    border-color: #e53935 !important;
    background: #fff;
    color: inherit;
    box-shadow: 0 1px 7px #ffeaea42;
}
#quickBuyModal .mb-3,
#quickBuyModal .form-group {
    margin-bottom: 0.32rem !important;
}

#quickBuyModal .form-label {
    margin-bottom: 0.12rem;
}

#quickBuyModal .form-text,
#quickBuyModal .invalid-feedback {
    margin-top: 0.04rem;
    margin-bottom: 0.04rem;
}

#quickBuyModal .form-control,
#quickBuyModal .form-select {
    font-size: .97rem;
    padding-top: .36rem;
    padding-bottom: .36rem;
}

/* Báo lỗi: ẩn mặc định, chỉ hiện khi có .is-invalid trên input/select */
#quickBuyModal .invalid-feedback {
    display: none;
    color: #e53935 !important;
    font-size: .96em;
    padding-left: 2px;
    margin-top: 2px;
    margin-bottom: 1px;
    font-style: normal;
    font-weight: 500;
}

#quickBuyModal .form-control.is-invalid + .invalid-feedback,
#quickBuyModal .form-select.is-invalid + .invalid-feedback {
    display: block !important;
}

#quickBuyModal .form-control.is-invalid,
#quickBuyModal .form-select.is-invalid {
    border-color: #e53935 !important;
    background: #fff;
    color: inherit;
    box-shadow: 0 1px 7px #ffeaea42;
}